travis: add an aarch64 Xenial job

.travis.yml

@@ -120,3 +120,11 @@ jobs:
               - set -e
               - sudo $CI_MANAGERS/xenial.sh
               - set +e
+
+        - name: Ubuntu Xenial (arm)
+          arch: arm64
+          language: bash
+          script:
+              - set -e
+              - sudo $CI_MANAGERS/xenial.sh
+              - set +e

travis-ci/managers/xenial.sh

@@ -2,9 +2,11 @@
 set -e
 set -x
 
+echo 'deb-src http://archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse' >>/etc/apt/sources.list
+
 apt-get update
 apt-get -y build-dep libelf-dev
-apt-get install -y libelf-dev
+apt-get install -y libelf-dev pkg-config
 
 source "$(dirname $0)/travis_wait.bash"